When I try installing the 1password extension (either from Safari or 1Password directly), it installs an older version (version 4) which doesn't work.
Then I saw there was an article stating that Mojave no longer requires an extension, and 1password is supposed to work automatically without it. So I therefore uninstalled the extension to see if that would help. However, when I visit a website there is no option to fill in any passwords, and I have to open the vault separately to do so.
How is the seamless use of 1password supported to work with Safari?